Key ring



FIG. 1 is front view of a key ring showing my new design, the rear view being identical;

FIG. 2 is side elevation view thereof, the other side being identical;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is bottom plan view thereof.

All portions shown in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a key ring, as shown and described. 